CA1284619C - Production tieback connector - Google Patents
Production tieback connectorInfo
- Publication number
- CA1284619C CA1284619C CA000556291A CA556291A CA1284619C CA 1284619 C CA1284619 C CA 1284619C CA 000556291 A CA000556291 A CA 000556291A CA 556291 A CA556291 A CA 556291A CA 1284619 C CA1284619 C CA 1284619C
- Authority
- CA
- Canada
- Prior art keywords
- sleeve
- shoulder
- annular body
- ring
- external
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000007789 sealing Methods 0.000 claims abstract description 6
- 230000036316 preload Effects 0.000 claims description 3
- 210000002832 shoulder Anatomy 0.000 description 14
- 239000004020 conductor Substances 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
- E21B33/035—Well heads; Setting-up thereof specially adapted for underwater installations
- E21B33/038—Connectors used on well heads, e.g. for connecting blow-out preventer and riser
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S285/00—Pipe joints or couplings
- Y10S285/92—Remotely controlled
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Earth Drilling (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
- Coupling Device And Connection With Printed Circuit (AREA)
- Details Of Connecting Devices For Male And Female Coupling (AREA)
- Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)
- Multi-Conductor Connections (AREA)
- Braking Arrangements (AREA)
- Mechanical Operated Clutches (AREA)
- Seal Device For Vehicle (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
- Amplifiers (AREA)
- Mechanical Coupling Of Light Guides (AREA)
- Fats And Perfumes (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
ABSTRACT
A subsea tieback connector including an annular body having an external downwardly facing shoulder with high pressure gasket type sealing means therein, a sleeve positioned within said annular body and having means preventing relative rotation between the sleeve and the body, a lock ring, an actuator ring threaded into said sleeve and having its lower end in engagement with an internal upwardly facing shoulder on said annular body whereby rotation of said actuating ring causes said lock ring to be set and then tensions said sleeve to load the connection.
A subsea tieback connector including an annular body having an external downwardly facing shoulder with high pressure gasket type sealing means therein, a sleeve positioned within said annular body and having means preventing relative rotation between the sleeve and the body, a lock ring, an actuator ring threaded into said sleeve and having its lower end in engagement with an internal upwardly facing shoulder on said annular body whereby rotation of said actuating ring causes said lock ring to be set and then tensions said sleeve to load the connection.
Description
~4~ 3 Backaround It is common practice in offshore oil and gas production to have the wellhead and related casing hangers mounted at the ocean floor with the xmas tree and other production equipment mounted above the water level on a production platform. In such situations tieback conductors are used to connect the subsea wellhead equipment to the platform mounted production equipment.
In a typical application the high pressure 18 3/4 inch casing head housing must be tied back to the production platform.
One example of a production tieback is shown in United States Patent No. 4,343,495 wherein item 10 is a casing head housing which is tied back to a production platform by connector 14 and conductor 12. Connector 14 is joined to housing 10 by threaded engagement.
Another example of a tieback is disclosed in United States Patent No. 3,497,243 wherein the conductor pipe 12 is threaded into wellhead housing 11.
Another tieback system is shown in United States Patent No. 4,046,405 wherein the connections include threads, latching mechanisms and an axially threaded nut.
Summarv The present invention provides a subsea wellhead comprising a wellhead housing having an upper tapered seat and internal groove below such seat, a tieback connector having an annular body with an external downwardly facing shoulder sized to be landed on said housing seat and an internal upwardly facing shoulder, a sleeve positioned within said annular body and having an external upwardly facing shoulder, upper external threads and r~
1~f34~1.'3 la 65845-324 means preventing rotation of said sl.eeve within said annular body, a locking ring carried by said external sleeve shoulder, said annular body having a lower end with a lower outer tapered surface which tapers upwardly and outwardly, an actuator ring threaded onto said sleeve external threads and engaging said annular body internal shoulder whereby rotation oE said actuator ring raises said sleeve to raise said locking ring into surrounding relationship to said lower annular body end and thus wedge said locking ring outward to set said locking ring into said housing internal groove and continued rotation of said actuator ring tensions said sleeve to preload the engagement between said wellhead housing seat and said body shoulder.
461~3 An object of the present invention is to provide an improved tieback connector which is not threadedly at-tached to the wellhead housing to which it is engaged.
Another object is to provide an improved tieback 05 connector which is pre-loaded when attached to the well-head housing.
A further object is to provide an improved tieback connector which readily accepts subsequent conductors therein which are to be tied back.
Brief Description of the Drawinqs These and other objects and advantages are herein-after set forth and explained with reference to the drawings wherein:
FIGURE 1 is a sectional view of the improved tieback connector of the present invention in its unset position within the wellhead housing to which it is to be attached.
FIGURE 2 is another sectional view of the improved tieback connector of the present invention after it has been attached to the wellhead housing and the connector has been pre-loaded.
Description of the Preferred Embodiment The normal subsea wellhead is positioned on the ocean floor and a platform has its support structure mounted on ocean floor around the subsea wellhead and production equipment is positioned above water level on platform. A
tieback conductor or casing 10 extends from tieback connector 12 to production equipment on the platform.
Tieback connector 12 includes body 14 which is generally tubular in shape and has outer downwardly facing shoulder 16 which is adapted to engage upwardly facing seat 18 on wellhead housing 20. Grooves 22 in shoulder 16 are filled with high pressure gasket type seal rings 24 for sealing against seat 18. The upper interior includes threads 26 into which tieback conductor 10 is engaged.
Tieback connector 12 also includes sleeve 28 which is 1~?34~1~<3 positioned within body 14 and actuator ring 30 which is positioned between the upper exterior portion of sleeve 28 and the interior of body 14. Pins 32 having their shanks 34 positioned within openings in sleeve 28 and 05 their heads 36 positioned within vertical slots 38 within body 14 at a position below shoulder 16 as shown in FIGURE
1. The lower exterior of sleeve 28 includes upwardly facing shoulder 40 and the lower interior of sleeve 28 includes threads 42 into which ring 44 is threaded and buttress threads 45 thereabove with the buttress threads 45a on the exterior of split latching ring 46 engaging the threads 45. Split latching ring 46 includes internal threads 48 which have their lower surfaces tapering upwardly and outwardly and their upper surfaces being substantially normal to the axis of sleeve 28. Threads 48 are relatively fine with respect to threads 45 so that there is limited relative rotation between split latching ring 46 and sleeve 28. This structure provides the support for subsequent conductor strings (not shown) to be run and to be latched in place by ring 46 since less than a full turn of the string is required to complete the setting of split latching ring 46. The upper exterior of sleeve 28 includes threads 50 into which threads 52 on the interior of actuator ring 30 engage. Actuator ring 30 includes upper slots 66 which are engaged by a suitable tool (not shown) for setting of the assembly as herein-after described. Actuator ring 30 is retained within body 14 between internal upwardly facing shoulder 56 and snap ring 58 which is positioned within groove 60 around the upper interior of body 14 immediately below threads 16.
Split lock ring 62 is positioned on external shoul-der 40 of sleeve 28 and below the lower end of body 14 which is provided with external cam surface 64 which is tapered downwardly and inwardly to coact with split lock ring 62 during setting. Seal ring 67 is positioned in groove 68 in the exterior of actuator ring 30 to seal 4~
between the exterior of actuator ring 30 and the interior of body 14. Seal ring 70 is positioned in groove 72 in the upper exterior of sleeve 28 to seal between the exterior of sleeve 28 and the interior of actuator ring 05 30.
As shown in FIGURE 2, settlng of tieback connector 12 is achieved by rotation of actuator ring 30. The threads 50 and 52 between sleeve 28 and actuator ring 30 causes sleeve 28 to move upwardly with respect to body 14.
This upward movement causes split loc~. ring 62 to be moved upwardly by its engagement with shoulder 40 and such movement causes it to be cammed outwardly by surface 64 on the lower end of body 14 into tight engagement within running groove 74 on the interior of wellhead housing 20.
Once lock ring 62 is set, further rotation creates a tension in sleeve 28 which preloads the joint to ensure tight engagement of shoulder 16 and seal rings 24 with seat 18 on the interior upper end of wellhead housing 20.
In a typical application the high pressure 18 3/4 inch casing head housing must be tied back to the production platform.
One example of a production tieback is shown in United States Patent No. 4,343,495 wherein item 10 is a casing head housing which is tied back to a production platform by connector 14 and conductor 12. Connector 14 is joined to housing 10 by threaded engagement.
Another example of a tieback is disclosed in United States Patent No. 3,497,243 wherein the conductor pipe 12 is threaded into wellhead housing 11.
Another tieback system is shown in United States Patent No. 4,046,405 wherein the connections include threads, latching mechanisms and an axially threaded nut.
Summarv The present invention provides a subsea wellhead comprising a wellhead housing having an upper tapered seat and internal groove below such seat, a tieback connector having an annular body with an external downwardly facing shoulder sized to be landed on said housing seat and an internal upwardly facing shoulder, a sleeve positioned within said annular body and having an external upwardly facing shoulder, upper external threads and r~
1~f34~1.'3 la 65845-324 means preventing rotation of said sl.eeve within said annular body, a locking ring carried by said external sleeve shoulder, said annular body having a lower end with a lower outer tapered surface which tapers upwardly and outwardly, an actuator ring threaded onto said sleeve external threads and engaging said annular body internal shoulder whereby rotation oE said actuator ring raises said sleeve to raise said locking ring into surrounding relationship to said lower annular body end and thus wedge said locking ring outward to set said locking ring into said housing internal groove and continued rotation of said actuator ring tensions said sleeve to preload the engagement between said wellhead housing seat and said body shoulder.
461~3 An object of the present invention is to provide an improved tieback connector which is not threadedly at-tached to the wellhead housing to which it is engaged.
Another object is to provide an improved tieback 05 connector which is pre-loaded when attached to the well-head housing.
A further object is to provide an improved tieback connector which readily accepts subsequent conductors therein which are to be tied back.
Brief Description of the Drawinqs These and other objects and advantages are herein-after set forth and explained with reference to the drawings wherein:
FIGURE 1 is a sectional view of the improved tieback connector of the present invention in its unset position within the wellhead housing to which it is to be attached.
FIGURE 2 is another sectional view of the improved tieback connector of the present invention after it has been attached to the wellhead housing and the connector has been pre-loaded.
Description of the Preferred Embodiment The normal subsea wellhead is positioned on the ocean floor and a platform has its support structure mounted on ocean floor around the subsea wellhead and production equipment is positioned above water level on platform. A
tieback conductor or casing 10 extends from tieback connector 12 to production equipment on the platform.
Tieback connector 12 includes body 14 which is generally tubular in shape and has outer downwardly facing shoulder 16 which is adapted to engage upwardly facing seat 18 on wellhead housing 20. Grooves 22 in shoulder 16 are filled with high pressure gasket type seal rings 24 for sealing against seat 18. The upper interior includes threads 26 into which tieback conductor 10 is engaged.
Tieback connector 12 also includes sleeve 28 which is 1~?34~1~<3 positioned within body 14 and actuator ring 30 which is positioned between the upper exterior portion of sleeve 28 and the interior of body 14. Pins 32 having their shanks 34 positioned within openings in sleeve 28 and 05 their heads 36 positioned within vertical slots 38 within body 14 at a position below shoulder 16 as shown in FIGURE
1. The lower exterior of sleeve 28 includes upwardly facing shoulder 40 and the lower interior of sleeve 28 includes threads 42 into which ring 44 is threaded and buttress threads 45 thereabove with the buttress threads 45a on the exterior of split latching ring 46 engaging the threads 45. Split latching ring 46 includes internal threads 48 which have their lower surfaces tapering upwardly and outwardly and their upper surfaces being substantially normal to the axis of sleeve 28. Threads 48 are relatively fine with respect to threads 45 so that there is limited relative rotation between split latching ring 46 and sleeve 28. This structure provides the support for subsequent conductor strings (not shown) to be run and to be latched in place by ring 46 since less than a full turn of the string is required to complete the setting of split latching ring 46. The upper exterior of sleeve 28 includes threads 50 into which threads 52 on the interior of actuator ring 30 engage. Actuator ring 30 includes upper slots 66 which are engaged by a suitable tool (not shown) for setting of the assembly as herein-after described. Actuator ring 30 is retained within body 14 between internal upwardly facing shoulder 56 and snap ring 58 which is positioned within groove 60 around the upper interior of body 14 immediately below threads 16.
Split lock ring 62 is positioned on external shoul-der 40 of sleeve 28 and below the lower end of body 14 which is provided with external cam surface 64 which is tapered downwardly and inwardly to coact with split lock ring 62 during setting. Seal ring 67 is positioned in groove 68 in the exterior of actuator ring 30 to seal 4~
between the exterior of actuator ring 30 and the interior of body 14. Seal ring 70 is positioned in groove 72 in the upper exterior of sleeve 28 to seal between the exterior of sleeve 28 and the interior of actuator ring 05 30.
As shown in FIGURE 2, settlng of tieback connector 12 is achieved by rotation of actuator ring 30. The threads 50 and 52 between sleeve 28 and actuator ring 30 causes sleeve 28 to move upwardly with respect to body 14.
This upward movement causes split loc~. ring 62 to be moved upwardly by its engagement with shoulder 40 and such movement causes it to be cammed outwardly by surface 64 on the lower end of body 14 into tight engagement within running groove 74 on the interior of wellhead housing 20.
Once lock ring 62 is set, further rotation creates a tension in sleeve 28 which preloads the joint to ensure tight engagement of shoulder 16 and seal rings 24 with seat 18 on the interior upper end of wellhead housing 20.
Claims (6)
1. A subsea wellhead comprising a wellhead housing having an upper tapered seat and internal groove below such seat, a tieback connector having an annular body with an external downwardly facing shoulder sized to be landed on said housing seat and an internal upwardly facing shoulder, a sleeve positioned within said annular body and having an external upwardly facing shoulder, upper external threads and means preventing rotation of said sleeve within said annular body, a locking ring carried by said external sleeve shoulder, said annular body having a lower end with a lower outer tapered surface which tapers upwardly and outwardly, an actuator ring threaded onto said sleeve external threads and engaging said annular body internal shoulder whereby rotation of said actuator ring raises said sleeve to raise said locking ring into surrounding relationship to said lower annular body end and thus wedge said locking ring outward to set said locking ring into said housing internal groove and continued rotation of said actuator ring tensions said sleeve to preload the engagement between said wellhead housing seat and said body shoulder.
2. A tieback connector according to claim 1 including sealing means carried by said body for providing a high pressure gasket seal against a sealing surface of the wellhead housing when said connector is secured.
3. A tieback connector according to claim 1 wherein said sealing means includes at least one groove in said exterior shoulder of said body, and a high pressure sealing gasket positioned within said groove.
4. A subsea wellhead according to claim 1 wherein said rotation preventing means includes at least one pin mounted in a slot within said annular body which extends axially therein and having its other end secured within said sleeve.
5. A subsea wellhead according to claim 1 including means securing said actuating ring within said annular body and against said internal body shoulder.
6. A subsea wellhead according to claim 1 wherein said wellhead housing seat and said external body shoulder are tapered downwardly and inwardly, and including gasket means positioned to provide a high pressure seal between said housing seat and said body shoulder.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/051,842 US4872708A (en) | 1987-05-18 | 1987-05-18 | Production tieback connector |
US07/051,842 | 1987-05-18 |
Publications (1)
Publication Number | Publication Date |
---|---|
CA1284619C true CA1284619C (en) | 1991-06-04 |
Family
ID=21973704
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA000556291A Expired - Lifetime CA1284619C (en) | 1987-05-18 | 1988-01-12 | Production tieback connector |
Country Status (9)
Country | Link |
---|---|
US (1) | US4872708A (en) |
EP (1) | EP0292084B1 (en) |
JP (1) | JPS63293295A (en) |
AT (1) | ATE98741T1 (en) |
AU (1) | AU592919B2 (en) |
BR (1) | BR8802386A (en) |
CA (1) | CA1284619C (en) |
DE (1) | DE3886258T2 (en) |
NO (1) | NO178939C (en) |
Families Citing this family (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4872708A (en) * | 1987-05-18 | 1989-10-10 | Cameron Iron Works Usa, Inc. | Production tieback connector |
US4941691A (en) * | 1988-06-08 | 1990-07-17 | Dril-Quip, Inc. | Subsea wellhead equipment |
US5259459A (en) * | 1991-05-03 | 1993-11-09 | Fmc Corporation | Subsea wellhead tieback connector |
US5247996A (en) * | 1991-11-15 | 1993-09-28 | Abb Vetco Gray Inc. | Self preloading connection for a subsea well assembly |
US5299642A (en) * | 1992-07-15 | 1994-04-05 | Abb Vetco Gray Inc. | Subsea wellhead tieback connector |
US5368335A (en) * | 1992-11-02 | 1994-11-29 | Abb Vetco Gray Inc. | Contingency tieback adapter |
US5279369A (en) * | 1993-01-13 | 1994-01-18 | Abb Vetco Gray Inc. | Tieback receptacle with upward and downward facing funnel sections |
US5435392A (en) * | 1994-01-26 | 1995-07-25 | Baker Hughes Incorporated | Liner tie-back sleeve |
US5782310A (en) * | 1996-04-10 | 1998-07-21 | Lange; James E. | Dry hollow stem augers |
US5775427A (en) * | 1996-11-13 | 1998-07-07 | Fmc Corporation | Internally latched subsea wellhead tieback connector |
US6012516A (en) * | 1997-09-05 | 2000-01-11 | Schlumberger Technology Corporation | Deviated borehole drilling assembly |
US6283208B1 (en) | 1997-09-05 | 2001-09-04 | Schlumberger Technology Corp. | Orienting tool and method |
US6279659B1 (en) | 1998-10-20 | 2001-08-28 | Weatherford Lamb, Inc. | Assembly and method for providing a means of support and positioning for drilling multi-lateral wells and for reentry therein through a premilled window |
AT504914B1 (en) * | 2007-04-19 | 2008-09-15 | Techmo Entw & Vertriebs Gmbh | PIPE CONNECTION SLEEVE |
US10373398B1 (en) | 2008-02-13 | 2019-08-06 | Stamps.Com Inc. | Systems and methods for distributed activation of postage |
US7896081B2 (en) * | 2008-05-09 | 2011-03-01 | Vetco Gray Inc. | Internal tieback for subsea well |
WO2012064380A2 (en) * | 2010-11-08 | 2012-05-18 | Cameron International Corporation | Gasket test protector sleeve for subsea mineral extraction equipment |
US9745817B2 (en) * | 2014-09-25 | 2017-08-29 | Vetco Gray Inc. | Internal tieback with outer diameter sealing capability |
US10161213B2 (en) * | 2016-07-26 | 2018-12-25 | Cameron International Corporation | Internal and external pressure seal assembly |
CN113605853B (en) * | 2021-08-27 | 2023-02-24 | 中海石油(中国)有限公司 | Low-pressure wellhead capable of being connected back |
Family Cites Families (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20529A (en) * | 1858-06-08 | Improved machine for finishing soldere d tu bing | ||
US3521909A (en) * | 1965-05-19 | 1970-07-28 | Richfield Oil Corp | Remote underwater wellhead connector |
US3497243A (en) * | 1966-01-05 | 1970-02-24 | Cameron Iron Works Inc | Pipe suspension apparatus |
US3608932A (en) * | 1970-02-18 | 1971-09-28 | Cicero C Brown | Powered coupling device |
US4046405A (en) * | 1972-05-15 | 1977-09-06 | Mcevoy Oilfield Equipment Co. | Run-in and tie back apparatus |
US3897823A (en) * | 1974-08-05 | 1975-08-05 | Vetco Offshore Ind Inc | Rotatably releasable casing hanger and packing running apparatus |
US3924679A (en) * | 1974-08-07 | 1975-12-09 | Vetco Offshore Ind Inc | Pressure operated apparatus for running and setting packing assemblies in wellheads |
US4019579A (en) * | 1975-05-02 | 1977-04-26 | Fmc Corporation | Apparatus for running, setting and testing a compression-type well packoff |
US4343495A (en) * | 1980-02-11 | 1982-08-10 | Vetco Offshore, Inc. | Conductor tieback connector |
US4615544A (en) * | 1982-02-16 | 1986-10-07 | Smith International, Inc. | Subsea wellhead system |
US4465134A (en) * | 1982-07-26 | 1984-08-14 | Hughes Tool Company | Tie-back connection apparatus and method |
US4519633A (en) * | 1983-06-29 | 1985-05-28 | Fmc Corporation | Subsea well casing tieback connector |
US4603886A (en) * | 1984-03-26 | 1986-08-05 | Vetco Offshore, Inc. | Snap type pipe connector |
US4651830A (en) * | 1985-07-03 | 1987-03-24 | Cameron Iron Works, Inc. | Marine wellhead structure |
US4696493A (en) * | 1986-06-11 | 1987-09-29 | Vetco-Gray Inc. | Subsea wellhead tieback system |
US4681166A (en) * | 1986-08-18 | 1987-07-21 | Hughes Tool Company | Internal nonrotating tie-back connector |
US4872708A (en) * | 1987-05-18 | 1989-10-10 | Cameron Iron Works Usa, Inc. | Production tieback connector |
-
1987
- 1987-05-18 US US07/051,842 patent/US4872708A/en not_active Expired - Lifetime
-
1988
- 1988-01-06 AU AU10092/88A patent/AU592919B2/en not_active Ceased
- 1988-01-11 AT AT88300168T patent/ATE98741T1/en not_active IP Right Cessation
- 1988-01-11 EP EP88300168A patent/EP0292084B1/en not_active Expired - Lifetime
- 1988-01-11 DE DE88300168T patent/DE3886258T2/en not_active Expired - Fee Related
- 1988-01-12 CA CA000556291A patent/CA1284619C/en not_active Expired - Lifetime
- 1988-02-12 JP JP63030678A patent/JPS63293295A/en active Pending
- 1988-05-16 NO NO882129A patent/NO178939C/en not_active IP Right Cessation
- 1988-05-17 BR BR8802386A patent/BR8802386A/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
DE3886258D1 (en) | 1994-01-27 |
NO178939B (en) | 1996-03-25 |
ATE98741T1 (en) | 1994-01-15 |
JPS63293295A (en) | 1988-11-30 |
NO882129D0 (en) | 1988-05-16 |
EP0292084A2 (en) | 1988-11-23 |
BR8802386A (en) | 1988-12-13 |
US4872708A (en) | 1989-10-10 |
DE3886258T2 (en) | 1994-04-07 |
AU592919B2 (en) | 1990-01-25 |
EP0292084A3 (en) | 1990-06-13 |
NO882129L (en) | 1988-11-21 |
NO178939C (en) | 1996-07-03 |
AU1009288A (en) | 1988-11-24 |
EP0292084B1 (en) | 1993-12-15 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
MKLA | Lapsed |